Portable power supply



FIG. 1 is a front, perspective view of a portable power supply showingour new design;

FIG. 2 is a rear, perspective view thereof;

FIG. 3 is a front, elevational view thereof;

FIG. 4 is a rear, elevational view thereof;

FIG. 5 is a left, side elevational view thereof;

FIG. 6 is a right, side elevational view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof;

FIG. 9 is an enlarged view of the area “9” shown in FIG. 1;

FIG. 10 is an enlarged view of the area “10” shown in FIG. 1; and,

FIG. 11 is an enlarged view of the area “11” shown in FIG. 2.

The broken lines in the drawings depict portions of the portable powersupply that form no part of the claimed design.

CLAIM The ornamental design for a portable power supply, as shown anddescribed.